Voice IP call Transfer problem

Unanswered Question
Jul 21st, 2008

I have a CallManager cluster version 5.1.3( one publisher and one subscriber)and a gatekpeer at center site. 3 remote site with a PBX at each site.

At center site, when calls come from PSTN, Transfer call is good. But when call come from remote site, calls can not transfer.

When Call between remote sites, transfer call is good.

Any one can tell me the problem ?


I have this problem too.
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Jaime Valencia Mon, 07/21/2008 - 06:21

if using H323 you need an MTP for the site that cannot transfer calls. that happens when an MTP cannot be allocated



if this helps, please rate

khanh_isphn Tue, 07/22/2008 - 18:53

Thank you for your support.

But i don't understand why we need an MTP ? I have a voice gateway 3845 to connect to PSTN.

How can I implement an MTP ?

khanh_isphn Tue, 07/22/2008 - 21:00

Hi javalenc

The Cisco IP Voice Media Streaming Application service has active. But the transfer call still doesn't work.

what can I do to resolve this problem ?

Jaime Valencia Wed, 07/23/2008 - 05:55

Make sure the gateway has access to the MTP, if you have it but the GW does not have access to it, it's as good as have it shutdown

you can go thru the SRND to understand more on MTPs, basic you need to know is that h323 cannot change the connection and you need an MTP to do so



if this helps, please rate

khanh_isphn Thu, 07/24/2008 - 02:01

Thank you for your supported!

But I don't known after active The Cisco IP Voice Media Streaming Application service. Do we have configuration in Gateway to access to the MTP or any other configuration on CCM.

Ayodeji Okanlawon Thu, 07/24/2008 - 02:36

When you activate the Cisco IP Voice Media Streaming Application service, the following components are automatically created.

1. ANN ..Annunciator

2. MTP..soft ware MTP

3. CFB...software conference bridge

4. MOH..Music On Hold

What you need to do, is create a MRG, assing these devices to the MRG.

You then need to create a MRGL, assign the MRG to it.

You will then assign your Gateway to the MRGL you created.

That way your gateway will have access to the Software MTP

khanh_isphn Thu, 07/24/2008 - 22:52

Hi aokanlawon

I have create MRG, MRGL and assign my gateway ( H323 GW) to the MRGL. But the transfer call still doesn't work.

What can I do next ?

Chad Stachowicz Thu, 07/24/2008 - 23:00

Actually, you need to assign this MRGL to the device pool in which your phone resides, and then reset the phone!!

go look under the phone and check the device pool. Then go to that device pool and assign the MRGL. Lastly reset the phone to have the changes take effect! All should be well then!!



khanh_isphn Fri, 08/01/2008 - 04:16

Dear all

I have add MRGL to device pool and reset the phone, device pool. But it is still does't work.

Any other configuration ?


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